Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com has links to 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.

HOME Schematics Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches
Welcome to DiscoverCircuits.com - online since 2002

See Media Kit for
Advertising Opportunities

Attention Designers:  Please alert us by eMail if we have linked to sites
where your original material has been copied without your permission.
We will change to the LINK to your site.  
Thank you.

 


Oscillators:  Crystal
#'s - N        O - Z
Oscillator Circuits -- Main Page
 

Last Updated: October 09, 2017 03:39 PM

Circuits Designed by Dave Johnson, P.E. :
Ultra Low Power 32Khz Crystal Oscillator - I have used this circuit many times when I needed a low frequency reference, which did not draw much power.  With the components show, the current from a 3v battery is less than 1.  2 microamps . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

Very Low Power Gated Crystal Oscillator - The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed.  The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. . . Circuit by David A. Johnson P.E.-June, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

One Second Time Base from Crystal Oscillator -  The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base.  Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division.  Using a crystal of some even multiple of 2 is desirable so that one stage of the counter automatically toggles every second which eliminates the need for the NAND gate and reset circuitry, however the circuit below illustrates using a crystal which is not an even multiple of 2 and so requires additional __ Designed by Bill Bowden

Pierce Crystal Oscillator Design -  The Pierce oscillator is essentially a common emitter amplifier with a tuned circuit for a collector load and a quartz crystal as a feedback element.  In order to determine whether the Barkhausen criterion is satisfied, loop gain must be determined at the frequency of oscillation.  This is accomplished by drawing the AC equivalent circuit of the Pierce Oscillator__ 

Pierce-gate Oscillator Crystal load calculator -  RF Design Tips, July 2004__ 

RadCom GPSDO -  10MHz GPS disciplined frequency standard.   __ Designed by EI9GQ homebrew radio

Specifying Quartz Crystals -  App Note/ 726 / Dec-08__ Maxim Integrated

Tiny Crystal Oscillator using LP2980 -  High-stability gate oscillator uses two, 5-pin SOT packaged devices.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Two Tone Audio Oscillator -  Circuit Only __ Contact Peter Parker VK3YE

Ultra Low Power 32Khz Crystal Oscillator -  I have used this circuit many times when I needed a low frequency reference, which did not draw much power.  With the components show, the current from a 3v battery is less than 1.  2 microamps . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

Ultra Low Voltage Crystal Oscillator using Active Loads -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Ultra Low Voltage Micropower Crystal Oscillator -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Use of the CMOS Unbuffered Inverter in Oscillator -  Texas Instrument Application ReportSZZA043 January 2004 __ Designed by Moshiul Haque and Ernest Cox

Using the 16MHz Crystal Oscillators -  Freescale AN2006 __ Designed by Freescale

Very Low Power Gated Crystal Oscillator -  The circuit gates the output of a continuously operating 32 KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed.  The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. . . Circuit by David A. Johnson P.E.-June, 2000

VHF Overtone Crystal Oscillators -  VHF overtone crystals can be difficult to use due to the many frequencies at which the crystal is perfectly happy to oscillate.  A typical 100 MHz, 5th-overtone crystal will oscillate at approximately 20 MHz, 60 MHz, 100 MHz, and even 140 MHz, not to mention other, unintended modes that such crystals often have.  Most VHF overtone oscillators use some sort of tuned circuit or frequency selective filter to select the desired mode and reject the other, equally active modes.  The oscillator circuit shown below uses a simple tuned circuit to select the desired mode and is suitable for VHF crystals, including high overtone types __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Wide Swing Variable Crystal Oscillator -  amateur radio construction projects.   __ Designed by Peter Parker

Wide-swing Variable Crystal Oscillator -  Timing and oscillator circuit diagrams / circuit schematics __ Designed by Peter Parker VK3YE

Xtal parameters with spectrum analyzer & tracking generator -  Crystal Parameters --- Experiments with a Tracking Generator + Spectrum Analyzer __ Contact Vasily Ivanenko

XTAL switcher using diodes -  Ham Radio - Other __ Designed by Guy Roels ON6MU

Xtal Tester -  This is a simple Xtal tester circuit.  T1 and Xtal have formed an oscillator.  C1 and C2 are voltage divider for oscillator.  If the Xtal is safe, the oscillator will work well and its output voltage will be rectified by C3, C4, D1 and D2, then T2 will run and LED will light.  The circuit is suitable to test 100 KHz - 30MHz Xtal. __ Contact IQ Technologies

XTAL-Controlled FM TX (V6) -  My FM Wireless microphone V5 has been very popular, both as a beginners project and as a kit.  It is interesting that it has also been the biggest cause of lots of e-mail, the most common question being How can I make it crystal controlled?.  The oscillator can be made crystal controlled; replace the 2p7 with a 5th harmonic crystal.  The oscillator will then be very stable, so stable in fact, that it cannot even be modulated! This means that you could only use it to send CW (Morse code)  __ Designed by Harry Lythall-SM0VPO


Oscillators:  Crystal Circuits     #'s - N        O - Z

 


Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches



 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |   
Privacy Policy


Discovercircuits.com endeavors to credit original designers.   Please alert us by eMail so we can
delete links to material that have been copied without your permission
.   Thank you.


Copyright of all original material on this website is the property
of David A. Johnson, P.E. (Dave Johnson & Associates ) unless otherwise noted.  

Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.
All material is provided "as is" without guarantees or warranty of any kind, either expressed or implied.